JP4514702B2 - Rotation detection sensor - Google Patents

Description

  The present invention relates to a rotation detection sensor such as an automobile wheel speed sensor or an engine speed sensor.

For example, as shown in FIGS. 9 and 10, the wheel speed sensor P has a detection portion a attached (provided) to a resin holder (bobbin) 2, and the detection portion from the opening in the covered cylindrical casing 1. a holder 2 mounted with a is inserted, a pair of relay terminals 5 is connected to the lead terminal 12 from the detection part a, and the relay terminal 5 is led out from the end face of the holder base and connected to the output cable 6; The relay opening 5 and part of the output cable 6 are embedded in the casing opening and the entire circumference of the exposed portion of the holder, and the resin coating 4 is used (see Patent Document 1).
Further, there is also a case in which the detection portion a is not directly mounted on the casing 1 but the detection portion a is directly coated with the resin 4 or the output cable 6 is directly connected to the lead terminal 12 without the relay terminal 5 being interposed. Yes (see Patent Documents 2 and 3).
JP 2002-257840 A JP 2003-57259 A JP 2003-66057 A

  As shown in FIG. 9, a lead terminal 12 is led out in parallel to a rotation detecting element 11 such as a Hall IC that detects magnetic field fluctuations, and an electron such as a capacitor is provided between the lead terminals 12 and 12. Some are provided with a component 13.

  The lead terminal 12 of the detection unit a is connected to the relay terminal 5 inserted in the holder 2 by soldering or the like. At this time, the Hall IC 11 is fitted in the hole 2 c of the holder 2, and the protrusion 2 d of the holder is fitted between the lead terminals 12, 12, so that the detection part a is positioned in the holder 2. A synthetic resin lid 7 is fitted into the holder 2.

  As shown in FIG. 9, the wheel speed sensor P is provided so as to face the rotating detection object B, detects a magnetic field variation due to rotation of the detection object B by the detection unit a, and converts it into an electrical signal. The signal is transmitted to an external control device via the relay terminal 5 and the output cable 6. The detected body B has a ferromagnetic pulsar ring provided with gear-like teeth at the peripheral edge, or a magnet magnetized so that S and N poles appear alternately and continuously on the peripheral surface. Pulsar ring is used. In this example, since the magnet 3 is provided in the holder 2, a ferromagnetic pulsar ring is employed.

In the manufacture of this type of wheel speed sensor P, the core wire 6a of the output cable 6 is normally connected to the lead terminal 12 as described above, and as shown in FIG. c is adopted.
At that time, if the core wire 6a and the lead terminal 12 are not positioned, the relative position between the two wires 12 and 6a is not determined and heat is not transmitted well, and the solder c is not sufficiently melted and may not be adapted. Further, since the connection is made by placing the core wire 6a and the lead terminal 12 on a part of the holder 2, the holder 2 is deprived of heat (as shown in FIG. 11A, the length of the connecting portion). Similarly, the holder 2 is in contact with the entire area in the vertical direction and is absorbed by the holder 2). Similarly, the solder c may not be sufficiently melted and may not be adapted.
If the solder c is not sufficiently melted and cannot be adapted, there arises a problem that the bonding strength between the core wire 6a and the lead terminal 12 becomes weak.

  Further, in order to prevent a short circuit due to contact between the pair of core wires 6a and the lead terminals 12, a partition wall 22 separating the pair of core wires 6a and the lead terminals 12 is provided in the holder 2 at the connection portion (the pair of core wires). 6a and the lead terminal 12 are provided with a partition wall 22), as shown in FIG. 11B, when confirming the solder fillet (the degree of formation of the solder layer) (confirmation from the direction of the arrow in the figure) There is a case where the partition wall 22 becomes an obstacle and the solder fillet visibility is poor and the solder state cannot be sufficiently confirmed, and the core wire 6a is in contact with the partition wall 22, and the solder c does not enter between them. May occur.

  This invention makes it the 1st subject to suppress the heat radiation at the time of soldering, and makes it the 2nd subject to improve the visibility of a solder fillet.

In order to achieve the first object, according to the present invention, a notch (concave portion) is formed on the surface of the holder to which the connecting portion between the core wire and the lead terminal is applied.
Due to the presence of the cutout, the heat that has conventionally escaped from the soldering iron or the like to the holder is reduced, so that sufficient heat can be secured for the familiarity of the solder.

Further, in order to achieve the second problem, the present invention forms a notch (concave portion) on a surface of the connecting portion between the core wire and the lead terminal facing the core wire of the partition wall separating the pair of core wires. It was.
This notch (opening upward) improves the visibility of the solder fillet and facilitates confirmation of the solder state. Further, the solder enters the notch, so that the bonding strength between the core wire and the lead terminal is also improved.

According to the present invention, since the heat escaping from the soldering iron or the like to the holder is reduced, it is possible to secure sufficient heat for the familiarity of the solder and to obtain a solder joint having a high joint strength.
In addition, since the solder state can be easily confirmed, it is possible to easily confirm the quality of the solder joint, to eliminate the occurrence of defective products in advance, and to improve the joint strength by solder.

As an embodiment of the present invention, a rotation detection element that detects a magnetic field variation due to rotation of a detected object and converts it into an electrical signal is attached to a holder, and output from the rotation detection element via a pair of lead terminals of the rotation detection element In the rotation detection sensor in which the cable is pulled out and the rotation detecting element, the lead terminal, the entire holder and a part of the output cable are embedded and resin-coated, a pair of lead terminals and a core wire of the output cable are connected to the holder. A partition wall is provided between the two connection parts to prevent contact between them, and heat escape when soldering the connection part to the holder in contact with the back surface of the lead terminal of both connection parts is prevented. The structure which provided the recessed part to perform can be employ | adopted.

In this configuration, a notch for making the soldering fillet easy to see can be provided on the surface of the partition wall facing the both connection portions, and the holder is provided on both sides of both connection portions to the outside of the core wire. It is also possible to provide a wall that prevents the movement of.
Further, a protrusion is provided on the inner side surface of the wall, and the surface of the protrusion on the partition side is an inclined surface that approaches the partition toward the inside of the pocket portion between the wall and the partition, and the core wire is formed in the pocket portion. As inserted, the core wire can be brought closer to the partition wall by the inclined surface of the projection, and can be surely along the partition wall. If the core wire reliably follows the partition, positioning with the lead terminal of the rotation detecting element becomes easy.

An embodiment is shown in FIG. 1 to FIG. 7, and the wheel speed sensor P of this embodiment is similar to the wheel speed sensor P shown in FIG. 9 and FIG. A lead piece 12 as a lead terminal is led out in parallel from the lead piece 12, and an electronic component 13 such as a capacitor is provided between the two lead pieces 12 and 12, but the lead piece 12 extends linearly from the Hall IC 11. It is. In addition, the same code | symbol as the above-mentioned shows the same thing.

  As shown in FIGS. 3 to 7, the resin molded product holder 20 has a fitting recess 14 for the Hall IC 11 formed in the front portion of one surface of the rectangular parallelepiped. Locking claws 15 that fit onto the surface of the Hall IC 11 are provided on both sides of the Hall IC fitting recess 14, and when the Hall IC 11 is fitted into the recess 14 from the front as shown in FIG. 5), the locking claw 15 is locked to the side protrusion 11a of the Hall IC 11 (see FIG. 4).

  An insertion hole 16 for the lead piece 12 is formed in the rear wall of the holder 20 (see FIGS. 1 and 5), and the lead piece 12 is inserted into the insertion hole 16 and the hole IC 11 is locked. Due to the locking by the claw 15, the detection part a is reliably positioned and set (held) on the holder 20. In the figure, reference numeral 8 denotes a locking tool that fits the holder 20 after the detection part a is set in the holder 20, and when the locking tool 8 fits in the holder 20, the detection part a is securely attached to the holder 20. Hold.

  The connecting portions 9, 9 between the lead piece 12 of the holder 20 and the pair of flexible core wires 6a of the output cable 6 are provided with a partition wall 22 positioned between them to prevent contact between the core wires 6a, 6a. A notch 23 is provided on the surface of the partition wall 22 facing the connection portions 9 and 9 so that the fillet of the soldering c connecting the lead piece 12 and the core wire 6a can be easily seen. The depth of the notch 23 (in the left-right direction in FIG. 8) is appropriately selected in consideration of the degree that the fillet of the soldering c can be easily seen. At this time, as long as the contact of the core wires 6a and 6a is prevented, both the notches 23 and 23 can be connected (the partition wall 22 is penetrated).

Further, the holder 20 in contact with the back surface of the lead piece 12 of both the connecting portions 9 and 9 is provided with a recess 24 for preventing escape of heat when the connecting portions 9 and 9 are soldered. As shown in FIG. 3, the recess 24 does not need to penetrate vertically, and as long as there is no hindrance to the support of the lead piece 12 on the surface of the holder 20 in contact with the lead piece 12, What is necessary is just to provide a hollow so that it may not contact | connect.

  Further, side walls 25 that prevent the flexible core wire 6a from moving to the outside are provided on both sides of the connecting portions 9 and 9 of the holder 20. The side wall 25 forms a pocket portion (a space surrounded by the side wall 25 and the partition wall 22) 25a, and when the cores 6a and 6a of the output cable 6 are set on the lead pieces 12 and 12, the pocket portion 25a The exposed core wires 6a and 6a at the end of the output cable 6 are inserted and positioned, and then the core wires 6a and 6a are placed along the partition wall 22 with the partition wall 22 interposed therebetween. At that time, as the core wires 6a, 6a are inserted into the pocket portions 25a, the core wires 6a, 6a are brought closer to the partition wall 22 side by the inclined surface 26a of the projection 26 on the inner side surface of the side wall 25 and are surely along the partition wall 22 (see FIG. 7), the lead terminal 12 and the core wire 6a are positioned on the same axis.

  As shown in FIG. 8A, the flexible core wire 6a is connected to the lead piece 12 by soldering c to the holder 20 with the detecting portion a by a soldering iron C. At the time of soldering c, the lead terminal 12 and the core wire 6a are positioned on the same axis, so that both the members 12 and 6a are securely joined, and as shown in FIG. The solder heat is prevented from diffusing and smooth soldering is performed. Further, as shown in FIG. 7B, the notch 23 makes it easy to see the fillet of the soldering c, so that it is easy to judge whether the soldering is good or bad. Further, the solder c enters the notch 23, so that the bonding strength between the core wire 6a and the lead terminal 12 is also improved. The shape of the recess 24 is not limited to an inverted L-shaped cross section as shown in the figure, and the surface of the lead terminal 12 and the holder 20 may be separated from each other at the joint between the lead terminal 12 and the core wire 6a.

After the flexible core wire 6a is connected to the lead piece 12, the Hall IC 11, the lead piece 12, the entire holder 20, the output cable 6 and a part of the mounting bracket 10 are embedded, and the resin coating 4 is applied to the rotation detection sensor. Get P.
During the resin molding, the side wall 25 prevents the flexible core wire 6a from moving outward. At this time, it is preferable to twist the entire flexible core wire 6a so as to eliminate the unraveling.

  Moreover, as shown in FIG. 2, the positioning rib e when attaching the wheel speed sensor P is set to a position different from the parting line T of the mold. Thus, the positioning rib e is not obscured by the burr of the parting line T. Therefore, as shown in FIG. 1, the wheel speed sensor P is inserted into the hole D of the mounting member A, and the fixing bracket 10 is attached. When screwing, the wheel speed sensor P can be attached to a predetermined accurate position with the positioning rib e.

  As shown in FIG. 10, even if the lead piece 12 has a U-shape, the partition 20, the notch 23, the recess 24, and the side wall 25 are formed as shown in FIG. The effects of the present invention can be obtained. The cutout 23, the side wall 25, and the protrusion 26 can be appropriately omitted as long as there is no hindrance.

  In the embodiment, the casing 20 is not provided and the entire holder 20 is directly resin-coated 4. However, in the wheel speed sensor P in which the holder 2 shown in FIG. However, the present invention can be adopted. In addition, although the embodiment is a wheel speed sensor, it is needless to say that the present invention can be adopted in other rotation detection sensors.

Main part cutting front view of one embodiment XX sectional view of FIG. The perspective view of the principal part of the Example XX sectional view of FIG. The exploded perspective view of the principal part of the example Perspective view from below of holder of same embodiment (A) is a bottom view of the holder, (b) is a right side view of (a). Operational diagram of this embodiment Cutaway front view of the main part of the conventional example The exploded perspective view of the detection part of the conventional example Operation diagram of the conventional example

Explanation of symbols

2, 20 Holder 4 Resin coating 6 Output cable 11 Hall IC (rotation detector)
12 Lead piece (Lead terminal)
14 Hall IC fitting recess 15 Claw 22 Bulkhead 23 Notch 24 Recess 25 Side wall 26 Projection 26a Projected inclined surface a Detecting portion e Positioning rib c Solder A Mounting member B Detected object C Soldering iron D Mounting hole for wheel speed sensor T Mold parting line P Wheel speed sensor (rotation detection sensor)

Claims (4)

A rotation detection element (11) for detecting a magnetic field variation due to rotation of the detection object (B) and converting it into an electric signal, a holder (20) to which the rotation detection element (11) is attached, and the rotation detection element (11) An output cable (6) drawn from the holder (20) via a pair of lead terminals (12, 12) of the rotation detection element (11), and the rotation detection element provided in the holder (20) (11) A pair of lead terminals (12, 12) and a pair of core wires (6a, 6a) of the output cable (6) are located between both connecting portions (9, 9) and contact between them. When soldering the connecting portion (9, 9) provided on the holder (20) in contact with the partition wall (22) to be prevented and the back surface of the lead terminal (12) of the both connecting portions (9, 9). A concave portion (24) for preventing escape of heat, and the rotation detecting element; (11), lead terminals (12), the both connecting portions of the holder I Do from the whole and buried partially resin-coated output cable (6) (20) (4), before Symbol septum (22) A rotation detection sensor characterized in that a notch (23) is provided on the surface facing (9, 9) to make the soldered fillet easy to see. The said holder (20) is provided with the wall (25, 25) which prevents the movement to the outer side of the said core wire (6a, 6a) on the both sides of the said both connection parts (9, 9). rotation detection sensor according to 1. A protrusion (26) is provided on the inner surface of the wall (25, 25), and the surface of the protrusion (26) on the partition (22) side is a pocket between the wall (25, 25) and the partition (22). It becomes the inclined surface (26a) which approaches the partition (22) toward the inside of the part (25a), and as the core wire (6a, 6a) is inserted into the pocket part (25a), the protrusion (26) 3. The rotation detection sensor according to claim 2 , wherein the core wire (6a, 6a) is brought close to the partition wall (22) by the inclined surface (26a) so as to be surely along the partition wall (22). . A rotation detection element (11) for detecting a magnetic field variation due to rotation of the detection object (B) and converting it into an electric signal, a holder (20) to which the rotation detection element (11) is attached, and the rotation detection element (11) An output cable (6) drawn from the holder (20) via a pair of lead terminals (12, 12) of the rotation detection element (11), and the rotation detection element provided in the holder (20) (11) A pair of lead terminals (12, 12) and a pair of core wires (6a, 6a) of the output cable (6) are located between both connecting portions (9, 9) and contact between them. When soldering the connecting portion (9, 9) provided on the holder (20) in contact with the partition wall (22) to be prevented and the back surface of the lead terminal (12) of the both connecting portions (9, 9). A concave portion (24) for preventing escape of heat, and the rotation detecting element; (11), lead terminals (12), I Do from the holder (20) of the total and a resin coating is embedded a portion of the output cable (6) (4),
In the holder (20), wherein provided wall (25, 25) to prevent outward movement of said core on either side of the two connecting portions (9, 9) (6a, 6a) Rutotomoni, its walls (25, 25) a protrusion (26) is provided on the inner surface, and the surface of the protrusion (26) on the side of the partition wall (22) is a pocket portion (25a) between the wall (25, 25) and the partition wall (22). The inclined surface (26a) approaches the partition wall (22) toward the inside, and the inclined surface (26a) of the protrusion (26) as the core wires (6a, 6a) are inserted into the pocket portion (25a). Thus, the rotation detection sensor is characterized in that the core wires (6a, 6a) are moved toward the partition wall (22) so as to be surely along the partition wall (22).

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